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Home >> Chevrolet >> 2007 >> Impala LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433 >> DTC P2544 >> Circuit/System Testing

Circuit/System Testing

Observe the DTCs in the scan tool.

If DTC P0604 is set, replace the ECM.
If DTC P0604 is not set, replace the TCM.

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